Finding the Fourth Proportional to 13,978.52, 19,290.39 and 7,691.30

Step by Step Solution

1. Step 1: Write the proportion equation
   13,978.52 : 19,290.39 = 7,691.30 : x
2. Step 2: Convert to fraction form
   13,978.52/19,290.39 = 7,691.30/x
3. Step 3: Cross multiply
   13,978.52x = 19,290.39 × 7,691.30
4. Step 4: Simplify right side
   13,978.52x = 148,368,176.61
5. Step 5: Solve for x
   x = 148,368,176.61/13,978.52
6. Step 6: Final answer
   x = 10,614.01