Finding the Fourth Proportional to 103,291.61, 142,530.72 and 57,960.23

Step by Step Solution

1. Step 1: Write the proportion equation
   103,291.61 : 142,530.72 = 57,960.23 : x
2. Step 2: Convert to fraction form
   103,291.61/142,530.72 = 57,960.23/x
3. Step 3: Cross multiply
   103,291.61x = 142,530.72 × 57,960.23
4. Step 4: Simplify right side
   103,291.61x = 8,261,113,313.27
5. Step 5: Solve for x
   x = 8,261,113,313.27/103,291.61
6. Step 6: Final answer
   x = 79,978.55