Finding the Fourth Proportional to 65,072.88, 97,689.12 and 42,904.80

Step by Step Solution

1. Step 1: Write the proportion equation
   65,072.88 : 97,689.12 = 42,904.80 : x
2. Step 2: Convert to fraction form
   65,072.88/97,689.12 = 42,904.80/x
3. Step 3: Cross multiply
   65,072.88x = 97,689.12 × 42,904.80
4. Step 4: Simplify right side
   65,072.88x = 4,191,332,155.78
5. Step 5: Solve for x
   x = 4,191,332,155.78/65,072.88
6. Step 6: Final answer
   x = 64,409.81