Finding the Fourth Proportional to 3,430.90, 5,146.72 and 1,121.86

Step by Step Solution

1. Step 1: Write the proportion equation
   3,430.90 : 5,146.72 = 1,121.86 : x
2. Step 2: Convert to fraction form
   3,430.90/5,146.72 = 1,121.86/x
3. Step 3: Cross multiply
   3,430.90x = 5,146.72 × 1,121.86
4. Step 4: Simplify right side
   3,430.90x = 5,773,899.30
5. Step 5: Solve for x
   x = 5,773,899.30/3,430.90
6. Step 6: Final answer
   x = 1,682.91