Finding the Fourth Proportional to 12,109.78, 16,712.13 and 7,393.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,109.78 : 16,712.13 = 7,393.78 : x
2. Step 2: Convert to fraction form
   12,109.78/16,712.13 = 7,393.78/x
3. Step 3: Cross multiply
   12,109.78x = 16,712.13 × 7,393.78
4. Step 4: Simplify right side
   12,109.78x = 123,565,812.55
5. Step 5: Solve for x
   x = 123,565,812.55/12,109.78
6. Step 6: Final answer
   x = 10,203.80