Finding the Fourth Proportional to 1,372.15, 1,892.50 and 899.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,372.15 : 1,892.50 = 899.52 : x
2. Step 2: Convert to fraction form
   1,372.15/1,892.50 = 899.52/x
3. Step 3: Cross multiply
   1,372.15x = 1,892.50 × 899.52
4. Step 4: Simplify right side
   1,372.15x = 1,702,341.60
5. Step 5: Solve for x
   x = 1,702,341.60/1,372.15
6. Step 6: Final answer
   x = 1,240.64