Finding the Fourth Proportional to 64,978.41, 89,675.42 and 51,659.58

Step by Step Solution

1. Step 1: Write the proportion equation
   64,978.41 : 89,675.42 = 51,659.58 : x
2. Step 2: Convert to fraction form
   64,978.41/89,675.42 = 51,659.58/x
3. Step 3: Cross multiply
   64,978.41x = 89,675.42 × 51,659.58
4. Step 4: Simplify right side
   64,978.41x = 4,632,594,275.23
5. Step 5: Solve for x
   x = 4,632,594,275.23/64,978.41
6. Step 6: Final answer
   x = 71,294.36