Finding the Fourth Proportional to 2,209.86, 3,312.63 and 1,055.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,209.86 : 3,312.63 = 1,055.34 : x
2. Step 2: Convert to fraction form
   2,209.86/3,312.63 = 1,055.34/x
3. Step 3: Cross multiply
   2,209.86x = 3,312.63 × 1,055.34
4. Step 4: Simplify right side
   2,209.86x = 3,495,950.94
5. Step 5: Solve for x
   x = 3,495,950.94/2,209.86
6. Step 6: Final answer
   x = 1,581.98