Finding the Fourth Proportional to 71,978.06, 99,329.46 and 40,146.93

Step by Step Solution

1. Step 1: Write the proportion equation
   71,978.06 : 99,329.46 = 40,146.93 : x
2. Step 2: Convert to fraction form
   71,978.06/99,329.46 = 40,146.93/x
3. Step 3: Cross multiply
   71,978.06x = 99,329.46 × 40,146.93
4. Step 4: Simplify right side
   71,978.06x = 3,987,772,877.56
5. Step 5: Solve for x
   x = 3,987,772,877.56/71,978.06
6. Step 6: Final answer
   x = 55,402.62