Finding the Fourth Proportional to 12,991.14, 19,488.77 and 5,597.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,991.14 : 19,488.77 = 5,597.72 : x
2. Step 2: Convert to fraction form
   12,991.14/19,488.77 = 5,597.72/x
3. Step 3: Cross multiply
   12,991.14x = 19,488.77 × 5,597.72
4. Step 4: Simplify right side
   12,991.14x = 109,092,552.17
5. Step 5: Solve for x
   x = 109,092,552.17/12,991.14
6. Step 6: Final answer
   x = 8,397.46