Finding the Fourth Proportional to 64,704.94, 89,319.54 and 42,900.55

Step by Step Solution

1. Step 1: Write the proportion equation
   64,704.94 : 89,319.54 = 42,900.55 : x
2. Step 2: Convert to fraction form
   64,704.94/89,319.54 = 42,900.55/x
3. Step 3: Cross multiply
   64,704.94x = 89,319.54 × 42,900.55
4. Step 4: Simplify right side
   64,704.94x = 3,831,857,329.33
5. Step 5: Solve for x
   x = 3,831,857,329.33/64,704.94
6. Step 6: Final answer
   x = 59,220.48