Finding the Fourth Proportional to 2,152.78, 2,969.93 and 1,312.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,152.78 : 2,969.93 = 1,312.81 : x
2. Step 2: Convert to fraction form
   2,152.78/2,969.93 = 1,312.81/x
3. Step 3: Cross multiply
   2,152.78x = 2,969.93 × 1,312.81
4. Step 4: Simplify right side
   2,152.78x = 3,898,949.66
5. Step 5: Solve for x
   x = 3,898,949.66/2,152.78
6. Step 6: Final answer
   x = 1,811.13