Finding the Fourth Proportional to 1,917.50, 2,877.12 and 1,431.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,917.50 : 2,877.12 = 1,431.50 : x
2. Step 2: Convert to fraction form
   1,917.50/2,877.12 = 1,431.50/x
3. Step 3: Cross multiply
   1,917.50x = 2,877.12 × 1,431.50
4. Step 4: Simplify right side
   1,917.50x = 4,118,582.89
5. Step 5: Solve for x
   x = 4,118,582.89/1,917.50
6. Step 6: Final answer
   x = 2,147.90