Finding the Fourth Proportional to 399,116.16, 598,498.56 and 149,623.20

Step by Step Solution

1. Step 1: Write the proportion equation
   399,116.16 : 598,498.56 = 149,623.20 : x
2. Step 2: Convert to fraction form
   399,116.16/598,498.56 = 149,623.20/x
3. Step 3: Cross multiply
   399,116.16x = 598,498.56 × 149,623.20
4. Step 4: Simplify right side
   399,116.16x = 89,549,269,742.59
5. Step 5: Solve for x
   x = 89,549,269,742.59/399,116.16
6. Step 6: Final answer
   x = 224,368.94