Finding the Fourth Proportional to 1,002.21, 1,501.59 and 900.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,002.21 : 1,501.59 = 900.76 : x
2. Step 2: Convert to fraction form
   1,002.21/1,501.59 = 900.76/x
3. Step 3: Cross multiply
   1,002.21x = 1,501.59 × 900.76
4. Step 4: Simplify right side
   1,002.21x = 1,352,572.21
5. Step 5: Solve for x
   x = 1,352,572.21/1,002.21
6. Step 6: Final answer
   x = 1,349.59