Finding the Fourth Proportional to 13,435.98, 20,126.28 and 7,872.47

Step by Step Solution

1. Step 1: Write the proportion equation
   13,435.98 : 20,126.28 = 7,872.47 : x
2. Step 2: Convert to fraction form
   13,435.98/20,126.28 = 7,872.47/x
3. Step 3: Cross multiply
   13,435.98x = 20,126.28 × 7,872.47
4. Step 4: Simplify right side
   13,435.98x = 158,443,434.88
5. Step 5: Solve for x
   x = 158,443,434.88/13,435.98
6. Step 6: Final answer
   x = 11,792.47