Finding the Fourth Proportional to 64,990.92, 89,654.22 and 42,367.80

Step by Step Solution

1. Step 1: Write the proportion equation
   64,990.92 : 89,654.22 = 42,367.80 : x
2. Step 2: Convert to fraction form
   64,990.92/89,654.22 = 42,367.80/x
3. Step 3: Cross multiply
   64,990.92x = 89,654.22 × 42,367.80
4. Step 4: Simplify right side
   64,990.92x = 3,798,452,062.12
5. Step 5: Solve for x
   x = 3,798,452,062.12/64,990.92
6. Step 6: Final answer
   x = 58,445.89