Finding the Fourth Proportional to 89,693.79, 134,474.80 and 42,979.47

Step by Step Solution

1. Step 1: Write the proportion equation
   89,693.79 : 134,474.80 = 42,979.47 : x
2. Step 2: Convert to fraction form
   89,693.79/134,474.80 = 42,979.47/x
3. Step 3: Cross multiply
   89,693.79x = 134,474.80 × 42,979.47
4. Step 4: Simplify right side
   89,693.79x = 5,779,655,632.36
5. Step 5: Solve for x
   x = 5,779,655,632.36/89,693.79
6. Step 6: Final answer
   x = 64,437.63