Finding the Fourth Proportional to 1,392.85, 2,088.06 and 899.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.85 : 2,088.06 = 899.56 : x
2. Step 2: Convert to fraction form
   1,392.85/2,088.06 = 899.56/x
3. Step 3: Cross multiply
   1,392.85x = 2,088.06 × 899.56
4. Step 4: Simplify right side
   1,392.85x = 1,878,335.25
5. Step 5: Solve for x
   x = 1,878,335.25/1,392.85
6. Step 6: Final answer
   x = 1,348.56