Finding the Fourth Proportional to 2,071.57, 3,107.86 and 610.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.57 : 3,107.86 = 610.70 : x
2. Step 2: Convert to fraction form
   2,071.57/3,107.86 = 610.70/x
3. Step 3: Cross multiply
   2,071.57x = 3,107.86 × 610.70
4. Step 4: Simplify right side
   2,071.57x = 1,897,976.34
5. Step 5: Solve for x
   x = 1,897,976.34/2,071.57
6. Step 6: Final answer
   x = 916.20