Finding the Fourth Proportional to 1,389.95, 2,083.71 and 1,312.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.95 : 2,083.71 = 1,312.59 : x
2. Step 2: Convert to fraction form
   1,389.95/2,083.71 = 1,312.59/x
3. Step 3: Cross multiply
   1,389.95x = 2,083.71 × 1,312.59
4. Step 4: Simplify right side
   1,389.95x = 2,735,056.91
5. Step 5: Solve for x
   x = 2,735,056.91/1,389.95
6. Step 6: Final answer
   x = 1,967.74