Finding the Fourth Proportional to 1,562.70, 2,156.04 and 899.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,562.70 : 2,156.04 = 899.31 : x
2. Step 2: Convert to fraction form
   1,562.70/2,156.04 = 899.31/x
3. Step 3: Cross multiply
   1,562.70x = 2,156.04 × 899.31
4. Step 4: Simplify right side
   1,562.70x = 1,938,948.33
5. Step 5: Solve for x
   x = 1,938,948.33/1,562.70
6. Step 6: Final answer
   x = 1,240.77