Finding the Fourth Proportional to 12,978.57, 19,443.24 and 7,702.43

Step by Step Solution

1. Step 1: Write the proportion equation
   12,978.57 : 19,443.24 = 7,702.43 : x
2. Step 2: Convert to fraction form
   12,978.57/19,443.24 = 7,702.43/x
3. Step 3: Cross multiply
   12,978.57x = 19,443.24 × 7,702.43
4. Step 4: Simplify right side
   12,978.57x = 149,760,195.07
5. Step 5: Solve for x
   x = 149,760,195.07/12,978.57
6. Step 6: Final answer
   x = 11,539.04