Finding the Fourth Proportional to 100,790.16, 139,096.17 and 57,776.82

Step by Step Solution

1. Step 1: Write the proportion equation
   100,790.16 : 139,096.17 = 57,776.82 : x
2. Step 2: Convert to fraction form
   100,790.16/139,096.17 = 57,776.82/x
3. Step 3: Cross multiply
   100,790.16x = 139,096.17 × 57,776.82
4. Step 4: Simplify right side
   100,790.16x = 8,036,534,376.78
5. Step 5: Solve for x
   x = 8,036,534,376.78/100,790.16
6. Step 6: Final answer
   x = 79,735.31