Finding the Fourth Proportional to 12,420.07, 17,139.73 and 7,114.93

Step by Step Solution

1. Step 1: Write the proportion equation
   12,420.07 : 17,139.73 = 7,114.93 : x
2. Step 2: Convert to fraction form
   12,420.07/17,139.73 = 7,114.93/x
3. Step 3: Cross multiply
   12,420.07x = 17,139.73 × 7,114.93
4. Step 4: Simplify right side
   12,420.07x = 121,947,979.17
5. Step 5: Solve for x
   x = 121,947,979.17/12,420.07
6. Step 6: Final answer
   x = 9,818.62