Finding the Fourth Proportional to 1,610.72, 2,222.61 and 947.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,610.72 : 2,222.61 = 947.78 : x
2. Step 2: Convert to fraction form
   1,610.72/2,222.61 = 947.78/x
3. Step 3: Cross multiply
   1,610.72x = 2,222.61 × 947.78
4. Step 4: Simplify right side
   1,610.72x = 2,106,534.19
5. Step 5: Solve for x
   x = 2,106,534.19/1,610.72
6. Step 6: Final answer
   x = 1,307.83