Finding the Fourth Proportional to 172,973.61, 259,491.78 and 78,248.42

Step by Step Solution

1. Step 1: Write the proportion equation
   172,973.61 : 259,491.78 = 78,248.42 : x
2. Step 2: Convert to fraction form
   172,973.61/259,491.78 = 78,248.42/x
3. Step 3: Cross multiply
   172,973.61x = 259,491.78 × 78,248.42
4. Step 4: Simplify right side
   172,973.61x = 20,304,820,490.53
5. Step 5: Solve for x
   x = 20,304,820,490.53/172,973.61
6. Step 6: Final answer
   x = 117,386.81