Finding the Fourth Proportional to 152,988, 211,123.52 and 85,920

Step by Step Solution

1. Step 1: Write the proportion equation
   152,988 : 211,123.52 = 85,920 : x
2. Step 2: Convert to fraction form
   152,988/211,123.52 = 85,920/x
3. Step 3: Cross multiply
   152,988x = 211,123.52 × 85,920
4. Step 4: Simplify right side
   152,988x = 18,139,732,838.40
5. Step 5: Solve for x
   x = 18,139,732,838.40/152,988
6. Step 6: Final answer
   x = 118,569.64