Finding the Fourth Proportional to 1,529.91, 2,111.27 and 900.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,529.91 : 2,111.27 = 900.45 : x
2. Step 2: Convert to fraction form
   1,529.91/2,111.27 = 900.45/x
3. Step 3: Cross multiply
   1,529.91x = 2,111.27 × 900.45
4. Step 4: Simplify right side
   1,529.91x = 1,901,088.57
5. Step 5: Solve for x
   x = 1,901,088.57/1,529.91
6. Step 6: Final answer
   x = 1,242.61