Finding the Fourth Proportional to 1,302,123.60, 1,796,865.12 and 721,314.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,302,123.60 : 1,796,865.12 = 721,314.72 : x
2. Step 2: Convert to fraction form
   1,302,123.60/1,796,865.12 = 721,314.72/x
3. Step 3: Cross multiply
   1,302,123.60x = 1,796,865.12 × 721,314.72
4. Step 4: Simplify right side
   1,302,123.60x = 1,296,105,260,910.57
5. Step 5: Solve for x
   x = 1,296,105,260,910.57/1,302,123.60
6. Step 6: Final answer
   x = 995,378.06