Finding the Fourth Proportional to 69,290.78, 103,889.47 and 55,980.15

Step by Step Solution

1. Step 1: Write the proportion equation
   69,290.78 : 103,889.47 = 55,980.15 : x
2. Step 2: Convert to fraction form
   69,290.78/103,889.47 = 55,980.15/x
3. Step 3: Cross multiply
   69,290.78x = 103,889.47 × 55,980.15
4. Step 4: Simplify right side
   69,290.78x = 5,815,748,114.02
5. Step 5: Solve for x
   x = 5,815,748,114.02/69,290.78
6. Step 6: Final answer
   x = 83,932.50