Finding the Fourth Proportional to 2,070.02, 3,105.57 and 771.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,070.02 : 3,105.57 = 771.50 : x
2. Step 2: Convert to fraction form
   2,070.02/3,105.57 = 771.50/x
3. Step 3: Cross multiply
   2,070.02x = 3,105.57 × 771.50
4. Step 4: Simplify right side
   2,070.02x = 2,395,947.26
5. Step 5: Solve for x
   x = 2,395,947.26/2,070.02
6. Step 6: Final answer
   x = 1,157.45