Finding the Fourth Proportional to 2,290.17, 3,434.43 and 990.93

Step by Step Solution

1. Step 1: Write the proportion equation
   2,290.17 : 3,434.43 = 990.93 : x
2. Step 2: Convert to fraction form
   2,290.17/3,434.43 = 990.93/x
3. Step 3: Cross multiply
   2,290.17x = 3,434.43 × 990.93
4. Step 4: Simplify right side
   2,290.17x = 3,403,279.72
5. Step 5: Solve for x
   x = 3,403,279.72/2,290.17
6. Step 6: Final answer
   x = 1,486.04