Finding the Fourth Proportional to 64,978.72, 89,670.90 and 35,170.72

Step by Step Solution

1. Step 1: Write the proportion equation
   64,978.72 : 89,670.90 = 35,170.72 : x
2. Step 2: Convert to fraction form
   64,978.72/89,670.90 = 35,170.72/x
3. Step 3: Cross multiply
   64,978.72x = 89,670.90 × 35,170.72
4. Step 4: Simplify right side
   64,978.72x = 3,153,790,116.05
5. Step 5: Solve for x
   x = 3,153,790,116.05/64,978.72
6. Step 6: Final answer
   x = 48,535.74