Finding the Fourth Proportional to 1,501.78, 2,073.58 and 913.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,501.78 : 2,073.58 = 913.12 : x
2. Step 2: Convert to fraction form
   1,501.78/2,073.58 = 913.12/x
3. Step 3: Cross multiply
   1,501.78x = 2,073.58 × 913.12
4. Step 4: Simplify right side
   1,501.78x = 1,893,427.37
5. Step 5: Solve for x
   x = 1,893,427.37/1,501.78
6. Step 6: Final answer
   x = 1,260.79