Finding the Fourth Proportional to 2,128.48, 3,191.44 and 1,002.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.48 : 3,191.44 = 1,002.40 : x
2. Step 2: Convert to fraction form
   2,128.48/3,191.44 = 1,002.40/x
3. Step 3: Cross multiply
   2,128.48x = 3,191.44 × 1,002.40
4. Step 4: Simplify right side
   2,128.48x = 3,199,099.46
5. Step 5: Solve for x
   x = 3,199,099.46/2,128.48
6. Step 6: Final answer
   x = 1,503.00