Finding the Fourth Proportional to 1,389,598.96, 1,916,123.76 and 905,265.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389,598.96 : 1,916,123.76 = 905,265.94 : x
2. Step 2: Convert to fraction form
   1,389,598.96/1,916,123.76 = 905,265.94/x
3. Step 3: Cross multiply
   1,389,598.96x = 1,916,123.76 × 905,265.94
4. Step 4: Simplify right side
   1,389,598.96x = 1,734,601,576,752.73
5. Step 5: Solve for x
   x = 1,734,601,576,752.73/1,389,598.96
6. Step 6: Final answer
   x = 1,248,274.95