Finding the Fourth Proportional to 1,570.28, 2,160.54 and 1,359.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,570.28 : 2,160.54 = 1,359.77 : x
2. Step 2: Convert to fraction form
   1,570.28/2,160.54 = 1,359.77/x
3. Step 3: Cross multiply
   1,570.28x = 2,160.54 × 1,359.77
4. Step 4: Simplify right side
   1,570.28x = 2,937,826.67
5. Step 5: Solve for x
   x = 2,937,826.67/1,570.28
6. Step 6: Final answer
   x = 1,870.90