Finding the Fourth Proportional to 1,345.47, 1,856.79 and 814.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,345.47 : 1,856.79 = 814.45 : x
2. Step 2: Convert to fraction form
   1,345.47/1,856.79 = 814.45/x
3. Step 3: Cross multiply
   1,345.47x = 1,856.79 × 814.45
4. Step 4: Simplify right side
   1,345.47x = 1,512,259.93
5. Step 5: Solve for x
   x = 1,512,259.93/1,345.47
6. Step 6: Final answer
   x = 1,123.97