Finding the Fourth Proportional to 78,931.26, 108,945 and 50,686.16

Step by Step Solution

1. Step 1: Write the proportion equation
   78,931.26 : 108,945 = 50,686.16 : x
2. Step 2: Convert to fraction form
   78,931.26/108,945 = 50,686.16/x
3. Step 3: Cross multiply
   78,931.26x = 108,945 × 50,686.16
4. Step 4: Simplify right side
   78,931.26x = 5,522,003,156.48
5. Step 5: Solve for x
   x = 5,522,003,156.48/78,931.26
6. Step 6: Final answer
   x = 69,959.65