Finding the Fourth Proportional to 1,616.90, 2,430.15 and 1,405.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,616.90 : 2,430.15 = 1,405.70 : x
2. Step 2: Convert to fraction form
   1,616.90/2,430.15 = 1,405.70/x
3. Step 3: Cross multiply
   1,616.90x = 2,430.15 × 1,405.70
4. Step 4: Simplify right side
   1,616.90x = 3,416,061.86
5. Step 5: Solve for x
   x = 3,416,061.86/1,616.90
6. Step 6: Final answer
   x = 2,112.72