Finding the Fourth Proportional to 64,900.75, 89,572.76 and 39,764.83

Step by Step Solution

1. Step 1: Write the proportion equation
   64,900.75 : 89,572.76 = 39,764.83 : x
2. Step 2: Convert to fraction form
   64,900.75/89,572.76 = 39,764.83/x
3. Step 3: Cross multiply
   64,900.75x = 89,572.76 × 39,764.83
4. Step 4: Simplify right side
   64,900.75x = 3,561,845,574.03
5. Step 5: Solve for x
   x = 3,561,845,574.03/64,900.75
6. Step 6: Final answer
   x = 54,881.42