Finding the Fourth Proportional to 154,002.80, 212,521.59 and 86,020.72

Step by Step Solution

1. Step 1: Write the proportion equation
   154,002.80 : 212,521.59 = 86,020.72 : x
2. Step 2: Convert to fraction form
   154,002.80/212,521.59 = 86,020.72/x
3. Step 3: Cross multiply
   154,002.80x = 212,521.59 × 86,020.72
4. Step 4: Simplify right side
   154,002.80x = 18,281,259,656.04
5. Step 5: Solve for x
   x = 18,281,259,656.04/154,002.80
6. Step 6: Final answer
   x = 118,707.32