Finding the Fourth Proportional to 90,938.62, 136,428.99 and 28,607.50

Step by Step Solution

1. Step 1: Write the proportion equation
   90,938.62 : 136,428.99 = 28,607.50 : x
2. Step 2: Convert to fraction form
   90,938.62/136,428.99 = 28,607.50/x
3. Step 3: Cross multiply
   90,938.62x = 136,428.99 × 28,607.50
4. Step 4: Simplify right side
   90,938.62x = 3,902,892,331.43
5. Step 5: Solve for x
   x = 3,902,892,331.43/90,938.62
6. Step 6: Final answer
   x = 42,917.88