Finding the Fourth Proportional to 172,307.19, 258,363.59 and 67,005.57

Step by Step Solution

1. Step 1: Write the proportion equation
   172,307.19 : 258,363.59 = 67,005.57 : x
2. Step 2: Convert to fraction form
   172,307.19/258,363.59 = 67,005.57/x
3. Step 3: Cross multiply
   172,307.19x = 258,363.59 × 67,005.57
4. Step 4: Simplify right side
   172,307.19x = 17,311,799,280.17
5. Step 5: Solve for x
   x = 17,311,799,280.17/172,307.19
6. Step 6: Final answer
   x = 100,470.56