Finding the Fourth Proportional to 53,317.31, 79,919.12 and 40,128.89

Step by Step Solution

1. Step 1: Write the proportion equation
   53,317.31 : 79,919.12 = 40,128.89 : x
2. Step 2: Convert to fraction form
   53,317.31/79,919.12 = 40,128.89/x
3. Step 3: Cross multiply
   53,317.31x = 79,919.12 × 40,128.89
4. Step 4: Simplify right side
   53,317.31x = 3,207,065,276.10
5. Step 5: Solve for x
   x = 3,207,065,276.10/53,317.31
6. Step 6: Final answer
   x = 60,150.55