Finding the Fourth Proportional to 1,386.86, 1,926.27 and 1,347.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.86 : 1,926.27 = 1,347.98 : x
2. Step 2: Convert to fraction form
   1,386.86/1,926.27 = 1,347.98/x
3. Step 3: Cross multiply
   1,386.86x = 1,926.27 × 1,347.98
4. Step 4: Simplify right side
   1,386.86x = 2,596,563.80
5. Step 5: Solve for x
   x = 2,596,563.80/1,386.86
6. Step 6: Final answer
   x = 1,872.27