Finding the Fourth Proportional to 1,407.48, 2,109.36 and 1,018.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,407.48 : 2,109.36 = 1,018.78 : x
2. Step 2: Convert to fraction form
   1,407.48/2,109.36 = 1,018.78/x
3. Step 3: Cross multiply
   1,407.48x = 2,109.36 × 1,018.78
4. Step 4: Simplify right side
   1,407.48x = 2,148,973.78
5. Step 5: Solve for x
   x = 2,148,973.78/1,407.48
6. Step 6: Final answer
   x = 1,526.82