Finding the Fourth Proportional to 13,139.42, 19,708.52 and 4,374

Step by Step Solution

1. Step 1: Write the proportion equation
   13,139.42 : 19,708.52 = 4,374 : x
2. Step 2: Convert to fraction form
   13,139.42/19,708.52 = 4,374/x
3. Step 3: Cross multiply
   13,139.42x = 19,708.52 × 4,374
4. Step 4: Simplify right side
   13,139.42x = 86,205,044.61
5. Step 5: Solve for x
   x = 86,205,044.61/13,139.42
6. Step 6: Final answer
   x = 6,560.80