Finding the Fourth Proportional to 1,290.56, 1,926.39 and 1,109.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290.56 : 1,926.39 = 1,109.12 : x
2. Step 2: Convert to fraction form
   1,290.56/1,926.39 = 1,109.12/x
3. Step 3: Cross multiply
   1,290.56x = 1,926.39 × 1,109.12
4. Step 4: Simplify right side
   1,290.56x = 2,136,592.13
5. Step 5: Solve for x
   x = 2,136,592.13/1,290.56
6. Step 6: Final answer
   x = 1,655.55