Finding the Fourth Proportional to 398,697,061.20, 598,157,566.20 and 194,231,806.80

Step by Step Solution

1. Step 1: Write the proportion equation
   398,697,061.20 : 598,157,566.20 = 194,231,806.80 : x
2. Step 2: Convert to fraction form
   398,697,061.20/598,157,566.20 = 194,231,806.80/x
3. Step 3: Cross multiply
   398,697,061.20x = 598,157,566.20 × 194,231,806.80
4. Step 4: Simplify right side
   398,697,061.20x = 116,181,224,834,116,624
5. Step 5: Solve for x
   x = 116,181,224,834,116,624/398,697,061.20
6. Step 6: Final answer
   x = 291,402,260.36