Finding the Fourth Proportional to 99,142.76, 148,720.94 and 39,978.92

Step by Step Solution

1. Step 1: Write the proportion equation
   99,142.76 : 148,720.94 = 39,978.92 : x
2. Step 2: Convert to fraction form
   99,142.76/148,720.94 = 39,978.92/x
3. Step 3: Cross multiply
   99,142.76x = 148,720.94 × 39,978.92
4. Step 4: Simplify right side
   99,142.76x = 5,945,702,562.58
5. Step 5: Solve for x
   x = 5,945,702,562.58/99,142.76
6. Step 6: Final answer
   x = 59,971.12