Finding the Fourth Proportional to 1,368.18, 1,888.71 and 871.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,368.18 : 1,888.71 = 871.50 : x
2. Step 2: Convert to fraction form
   1,368.18/1,888.71 = 871.50/x
3. Step 3: Cross multiply
   1,368.18x = 1,888.71 × 871.50
4. Step 4: Simplify right side
   1,368.18x = 1,646,010.77
5. Step 5: Solve for x
   x = 1,646,010.77/1,368.18
6. Step 6: Final answer
   x = 1,203.07