Finding the Fourth Proportional to 74,354.81, 102,649.61 and 57,321.72

Step by Step Solution

1. Step 1: Write the proportion equation
   74,354.81 : 102,649.61 = 57,321.72 : x
2. Step 2: Convert to fraction form
   74,354.81/102,649.61 = 57,321.72/x
3. Step 3: Cross multiply
   74,354.81x = 102,649.61 × 57,321.72
4. Step 4: Simplify right side
   74,354.81x = 5,884,052,345.83
5. Step 5: Solve for x
   x = 5,884,052,345.83/74,354.81
6. Step 6: Final answer
   x = 79,134.80