Finding the Fourth Proportional to 72,312.70, 99,788.61 and 42,098.89

Step by Step Solution

1. Step 1: Write the proportion equation
   72,312.70 : 99,788.61 = 42,098.89 : x
2. Step 2: Convert to fraction form
   72,312.70/99,788.61 = 42,098.89/x
3. Step 3: Cross multiply
   72,312.70x = 99,788.61 × 42,098.89
4. Step 4: Simplify right side
   72,312.70x = 4,200,989,715.64
5. Step 5: Solve for x
   x = 4,200,989,715.64/72,312.70
6. Step 6: Final answer
   x = 58,094.77