Finding the Fourth Proportional to 1,531.69, 2,300.57 and 1,312.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,531.69 : 2,300.57 = 1,312.23 : x
2. Step 2: Convert to fraction form
   1,531.69/2,300.57 = 1,312.23/x
3. Step 3: Cross multiply
   1,531.69x = 2,300.57 × 1,312.23
4. Step 4: Simplify right side
   1,531.69x = 3,018,861.78
5. Step 5: Solve for x
   x = 3,018,861.78/1,531.69
6. Step 6: Final answer
   x = 1,970.94