Finding the Fourth Proportional to 12,591.47, 17,377.59 and 7,877.27

Step by Step Solution

1. Step 1: Write the proportion equation
   12,591.47 : 17,377.59 = 7,877.27 : x
2. Step 2: Convert to fraction form
   12,591.47/17,377.59 = 7,877.27/x
3. Step 3: Cross multiply
   12,591.47x = 17,377.59 × 7,877.27
4. Step 4: Simplify right side
   12,591.47x = 136,887,881.49
5. Step 5: Solve for x
   x = 136,887,881.49/12,591.47
6. Step 6: Final answer
   x = 10,871.48