Finding the Fourth Proportional to 1,143,665.48, 1,578,490.69 and 776,261.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,143,665.48 : 1,578,490.69 = 776,261.01 : x
2. Step 2: Convert to fraction form
   1,143,665.48/1,578,490.69 = 776,261.01/x
3. Step 3: Cross multiply
   1,143,665.48x = 1,578,490.69 × 776,261.01
4. Step 4: Simplify right side
   1,143,665.48x = 1,225,320,775,354.34
5. Step 5: Solve for x
   x = 1,225,320,775,354.34/1,143,665.48
6. Step 6: Final answer
   x = 1,071,397.89