Finding the Fourth Proportional to 1,055,078.69, 1,582,620.01 and 256,360.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,055,078.69 : 1,582,620.01 = 256,360.91 : x
2. Step 2: Convert to fraction form
   1,055,078.69/1,582,620.01 = 256,360.91/x
3. Step 3: Cross multiply
   1,055,078.69x = 1,582,620.01 × 256,360.91
4. Step 4: Simplify right side
   1,055,078.69x = 405,721,897,393.81
5. Step 5: Solve for x
   x = 405,721,897,393.81/1,055,078.69
6. Step 6: Final answer
   x = 384,541.84