Finding the Fourth Proportional to 1,360.78, 1,875.34 and 1,111.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,360.78 : 1,875.34 = 1,111.30 : x
2. Step 2: Convert to fraction form
   1,360.78/1,875.34 = 1,111.30/x
3. Step 3: Cross multiply
   1,360.78x = 1,875.34 × 1,111.30
4. Step 4: Simplify right side
   1,360.78x = 2,084,065.34
5. Step 5: Solve for x
   x = 2,084,065.34/1,360.78
6. Step 6: Final answer
   x = 1,531.52