Finding the Fourth Proportional to 65,302.38, 90,104.94 and 61,980.57

Step by Step Solution

1. Step 1: Write the proportion equation
   65,302.38 : 90,104.94 = 61,980.57 : x
2. Step 2: Convert to fraction form
   65,302.38/90,104.94 = 61,980.57/x
3. Step 3: Cross multiply
   65,302.38x = 90,104.94 × 61,980.57
4. Step 4: Simplify right side
   65,302.38x = 5,584,755,541.02
5. Step 5: Solve for x
   x = 5,584,755,541.02/65,302.38
6. Step 6: Final answer
   x = 85,521.47