Finding the Fourth Proportional to 86,521, 119,290.82 and 72,201.40

Step by Step Solution

1. Step 1: Write the proportion equation
   86,521 : 119,290.82 = 72,201.40 : x
2. Step 2: Convert to fraction form
   86,521/119,290.82 = 72,201.40/x
3. Step 3: Cross multiply
   86,521x = 119,290.82 × 72,201.40
4. Step 4: Simplify right side
   86,521x = 8,612,964,211.15
5. Step 5: Solve for x
   x = 8,612,964,211.15/86,521
6. Step 6: Final answer
   x = 99,547.67