Finding the Fourth Proportional to 138,914, 208,482.72 and 72,374

Step by Step Solution

1. Step 1: Write the proportion equation
   138,914 : 208,482.72 = 72,374 : x
2. Step 2: Convert to fraction form
   138,914/208,482.72 = 72,374/x
3. Step 3: Cross multiply
   138,914x = 208,482.72 × 72,374
4. Step 4: Simplify right side
   138,914x = 15,088,728,377.28
5. Step 5: Solve for x
   x = 15,088,728,377.28/138,914
6. Step 6: Final answer
   x = 108,619.21