Finding the Fourth Proportional to 1,611.23, 2,222.78 and 947.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,611.23 : 2,222.78 = 947.77 : x
2. Step 2: Convert to fraction form
   1,611.23/2,222.78 = 947.77/x
3. Step 3: Cross multiply
   1,611.23x = 2,222.78 × 947.77
4. Step 4: Simplify right side
   1,611.23x = 2,106,673.90
5. Step 5: Solve for x
   x = 2,106,673.90/1,611.23
6. Step 6: Final answer
   x = 1,307.50