Finding the Fourth Proportional to 1,400.55, 1,931.68 and 902.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,400.55 : 1,931.68 = 902.89 : x
2. Step 2: Convert to fraction form
   1,400.55/1,931.68 = 902.89/x
3. Step 3: Cross multiply
   1,400.55x = 1,931.68 × 902.89
4. Step 4: Simplify right side
   1,400.55x = 1,744,094.56
5. Step 5: Solve for x
   x = 1,744,094.56/1,400.55
6. Step 6: Final answer
   x = 1,245.29