Finding the Fourth Proportional to 72,321.78, 99,807.76 and 40,488.78

Step by Step Solution

1. Step 1: Write the proportion equation
   72,321.78 : 99,807.76 = 40,488.78 : x
2. Step 2: Convert to fraction form
   72,321.78/99,807.76 = 40,488.78/x
3. Step 3: Cross multiply
   72,321.78x = 99,807.76 × 40,488.78
4. Step 4: Simplify right side
   72,321.78x = 4,041,094,436.93
5. Step 5: Solve for x
   x = 4,041,094,436.93/72,321.78
6. Step 6: Final answer
   x = 55,876.59