Finding the Fourth Proportional to 64,807.31, 89,434.10 and 34,999.31

Step by Step Solution

1. Step 1: Write the proportion equation
   64,807.31 : 89,434.10 = 34,999.31 : x
2. Step 2: Convert to fraction form
   64,807.31/89,434.10 = 34,999.31/x
3. Step 3: Cross multiply
   64,807.31x = 89,434.10 × 34,999.31
4. Step 4: Simplify right side
   64,807.31x = 3,130,132,101.55
5. Step 5: Solve for x
   x = 3,130,132,101.55/64,807.31
6. Step 6: Final answer
   x = 48,299.06