Finding the Fourth Proportional to 64,959.01, 89,705.34 and 61,421.07

Step by Step Solution

1. Step 1: Write the proportion equation
   64,959.01 : 89,705.34 = 61,421.07 : x
2. Step 2: Convert to fraction form
   64,959.01/89,705.34 = 61,421.07/x
3. Step 3: Cross multiply
   64,959.01x = 89,705.34 × 61,421.07
4. Step 4: Simplify right side
   64,959.01x = 5,509,797,778.61
5. Step 5: Solve for x
   x = 5,509,797,778.61/64,959.01
6. Step 6: Final answer
   x = 84,819.61