Finding the Fourth Proportional to 1,605.15, 2,406.89 and 947.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,605.15 : 2,406.89 = 947.22 : x
2. Step 2: Convert to fraction form
   1,605.15/2,406.89 = 947.22/x
3. Step 3: Cross multiply
   1,605.15x = 2,406.89 × 947.22
4. Step 4: Simplify right side
   1,605.15x = 2,279,849.61
5. Step 5: Solve for x
   x = 2,279,849.61/1,605.15
6. Step 6: Final answer
   x = 1,420.33