Finding the Fourth Proportional to 1,383,946.72, 1,909,912.82 and 780,321.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,383,946.72 : 1,909,912.82 = 780,321.76 : x
2. Step 2: Convert to fraction form
   1,383,946.72/1,909,912.82 = 780,321.76/x
3. Step 3: Cross multiply
   1,383,946.72x = 1,909,912.82 × 780,321.76
4. Step 4: Simplify right side
   1,383,946.72x = 1,490,346,533,148.96
5. Step 5: Solve for x
   x = 1,490,346,533,148.96/1,383,946.72
6. Step 6: Final answer
   x = 1,076,881.44