Finding the Fourth Proportional to 89,646.20, 134,426.60 and 52,216.72

Step by Step Solution

1. Step 1: Write the proportion equation
   89,646.20 : 134,426.60 = 52,216.72 : x
2. Step 2: Convert to fraction form
   89,646.20/134,426.60 = 52,216.72/x
3. Step 3: Cross multiply
   89,646.20x = 134,426.60 × 52,216.72
4. Step 4: Simplify right side
   89,646.20x = 7,019,316,132.75
5. Step 5: Solve for x
   x = 7,019,316,132.75/89,646.20
6. Step 6: Final answer
   x = 78,300.21