Finding the Fourth Proportional to 138,978.84, 208,468.32 and 55,872.84

Step by Step Solution

1. Step 1: Write the proportion equation
   138,978.84 : 208,468.32 = 55,872.84 : x
2. Step 2: Convert to fraction form
   138,978.84/208,468.32 = 55,872.84/x
3. Step 3: Cross multiply
   138,978.84x = 208,468.32 × 55,872.84
4. Step 4: Simplify right side
   138,978.84x = 11,647,717,088.43
5. Step 5: Solve for x
   x = 11,647,717,088.43/138,978.84
6. Step 6: Final answer
   x = 83,809.28