Finding the Fourth Proportional to 1,931.88, 2,900.70 and 1,111.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,931.88 : 2,900.70 = 1,111.08 : x
2. Step 2: Convert to fraction form
   1,931.88/2,900.70 = 1,111.08/x
3. Step 3: Cross multiply
   1,931.88x = 2,900.70 × 1,111.08
4. Step 4: Simplify right side
   1,931.88x = 3,222,909.76
5. Step 5: Solve for x
   x = 3,222,909.76/1,931.88
6. Step 6: Final answer
   x = 1,668.28