Finding the Fourth Proportional to 1,490.10, 2,056.28 and 900.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,490.10 : 2,056.28 = 900.53 : x
2. Step 2: Convert to fraction form
   1,490.10/2,056.28 = 900.53/x
3. Step 3: Cross multiply
   1,490.10x = 2,056.28 × 900.53
4. Step 4: Simplify right side
   1,490.10x = 1,851,741.83
5. Step 5: Solve for x
   x = 1,851,741.83/1,490.10
6. Step 6: Final answer
   x = 1,242.70