Finding the Fourth Proportional to 1,573.31, 2,172.48 and 1,312.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,573.31 : 2,172.48 = 1,312.69 : x
2. Step 2: Convert to fraction form
   1,573.31/2,172.48 = 1,312.69/x
3. Step 3: Cross multiply
   1,573.31x = 2,172.48 × 1,312.69
4. Step 4: Simplify right side
   1,573.31x = 2,851,792.77
5. Step 5: Solve for x
   x = 2,851,792.77/1,573.31
6. Step 6: Final answer
   x = 1,812.61