Finding the Fourth Proportional to 115,200.42, 158,978.18 and 64,211.74

Step by Step Solution

1. Step 1: Write the proportion equation
   115,200.42 : 158,978.18 = 64,211.74 : x
2. Step 2: Convert to fraction form
   115,200.42/158,978.18 = 64,211.74/x
3. Step 3: Cross multiply
   115,200.42x = 158,978.18 × 64,211.74
4. Step 4: Simplify right side
   115,200.42x = 10,208,265,559.83
5. Step 5: Solve for x
   x = 10,208,265,559.83/115,200.42
6. Step 6: Final answer
   x = 88,613.09