Finding the Fourth Proportional to 13,978.27, 19,290.95 and 7,691.05

Step by Step Solution

1. Step 1: Write the proportion equation
   13,978.27 : 19,290.95 = 7,691.05 : x
2. Step 2: Convert to fraction form
   13,978.27/19,290.95 = 7,691.05/x
3. Step 3: Cross multiply
   13,978.27x = 19,290.95 × 7,691.05
4. Step 4: Simplify right side
   13,978.27x = 148,367,661.00
5. Step 5: Solve for x
   x = 148,367,661.00/13,978.27
6. Step 6: Final answer
   x = 10,614.16