Finding the Fourth Proportional to 72,075.78, 99,560.61 and 57,981.78

Step by Step Solution

1. Step 1: Write the proportion equation
   72,075.78 : 99,560.61 = 57,981.78 : x
2. Step 2: Convert to fraction form
   72,075.78/99,560.61 = 57,981.78/x
3. Step 3: Cross multiply
   72,075.78x = 99,560.61 × 57,981.78
4. Step 4: Simplify right side
   72,075.78x = 5,772,701,385.69
5. Step 5: Solve for x
   x = 5,772,701,385.69/72,075.78
6. Step 6: Final answer
   x = 80,092.11