Finding the Fourth Proportional to 1,387.34, 1,913.60 and 1,092.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387.34 : 1,913.60 = 1,092.10 : x
2. Step 2: Convert to fraction form
   1,387.34/1,913.60 = 1,092.10/x
3. Step 3: Cross multiply
   1,387.34x = 1,913.60 × 1,092.10
4. Step 4: Simplify right side
   1,387.34x = 2,089,841.02
5. Step 5: Solve for x
   x = 2,089,841.02/1,387.34
6. Step 6: Final answer
   x = 1,506.36