Finding the Fourth Proportional to 2,085.06, 3,124.88 and 987.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.06 : 3,124.88 = 987.90 : x
2. Step 2: Convert to fraction form
   2,085.06/3,124.88 = 987.90/x
3. Step 3: Cross multiply
   2,085.06x = 3,124.88 × 987.90
4. Step 4: Simplify right side
   2,085.06x = 3,087,068.95
5. Step 5: Solve for x
   x = 3,087,068.95/2,085.06
6. Step 6: Final answer
   x = 1,480.57