Finding the Fourth Proportional to 426,377.16, 639,351.78 and 141,967.50

Step by Step Solution

1. Step 1: Write the proportion equation
   426,377.16 : 639,351.78 = 141,967.50 : x
2. Step 2: Convert to fraction form
   426,377.16/639,351.78 = 141,967.50/x
3. Step 3: Cross multiply
   426,377.16x = 639,351.78 × 141,967.50
4. Step 4: Simplify right side
   426,377.16x = 90,767,173,827.15
5. Step 5: Solve for x
   x = 90,767,173,827.15/426,377.16
6. Step 6: Final answer
   x = 212,880.01