Finding the Fourth Proportional to 1,870.19, 2,580.20 and 1,123.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.19 : 2,580.20 = 1,123.57 : x
2. Step 2: Convert to fraction form
   1,870.19/2,580.20 = 1,123.57/x
3. Step 3: Cross multiply
   1,870.19x = 2,580.20 × 1,123.57
4. Step 4: Simplify right side
   1,870.19x = 2,899,043.45
5. Step 5: Solve for x
   x = 2,899,043.45/1,870.19
6. Step 6: Final answer
   x = 1,550.13