Finding the Fourth Proportional to 1,667.05, 2,300.53 and 1,225.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,667.05 : 2,300.53 = 1,225.78 : x
2. Step 2: Convert to fraction form
   1,667.05/2,300.53 = 1,225.78/x
3. Step 3: Cross multiply
   1,667.05x = 2,300.53 × 1,225.78
4. Step 4: Simplify right side
   1,667.05x = 2,819,943.66
5. Step 5: Solve for x
   x = 2,819,943.66/1,667.05
6. Step 6: Final answer
   x = 1,691.58