Finding the Fourth Proportional to 2,100.90, 3,149.35 and 784.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.90 : 3,149.35 = 784.30 : x
2. Step 2: Convert to fraction form
   2,100.90/3,149.35 = 784.30/x
3. Step 3: Cross multiply
   2,100.90x = 3,149.35 × 784.30
4. Step 4: Simplify right side
   2,100.90x = 2,470,035.21
5. Step 5: Solve for x
   x = 2,470,035.21/2,100.90
6. Step 6: Final answer
   x = 1,175.70