Finding the Fourth Proportional to 72,880.68, 109,443.90 and 69,139.56

Step by Step Solution

1. Step 1: Write the proportion equation
   72,880.68 : 109,443.90 = 69,139.56 : x
2. Step 2: Convert to fraction form
   72,880.68/109,443.90 = 69,139.56/x
3. Step 3: Cross multiply
   72,880.68x = 109,443.90 × 69,139.56
4. Step 4: Simplify right side
   72,880.68x = 7,566,903,090.68
5. Step 5: Solve for x
   x = 7,566,903,090.68/72,880.68
6. Step 6: Final answer
   x = 103,825.91