Finding the Fourth Proportional to 1,345.89, 2,018.55 and 954.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,345.89 : 2,018.55 = 954.78 : x
2. Step 2: Convert to fraction form
   1,345.89/2,018.55 = 954.78/x
3. Step 3: Cross multiply
   1,345.89x = 2,018.55 × 954.78
4. Step 4: Simplify right side
   1,345.89x = 1,927,271.17
5. Step 5: Solve for x
   x = 1,927,271.17/1,345.89
6. Step 6: Final answer
   x = 1,431.97