Finding the Fourth Proportional to 13,498.32, 20,251.37 and 4,139.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,498.32 : 20,251.37 = 4,139.72 : x
2. Step 2: Convert to fraction form
   13,498.32/20,251.37 = 4,139.72/x
3. Step 3: Cross multiply
   13,498.32x = 20,251.37 × 4,139.72
4. Step 4: Simplify right side
   13,498.32x = 83,834,991.64
5. Step 5: Solve for x
   x = 83,834,991.64/13,498.32
6. Step 6: Final answer
   x = 6,210.77