Finding the Fourth Proportional to 1,055,256.39, 1,582,873.12 and 256,538.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,055,256.39 : 1,582,873.12 = 256,538.78 : x
2. Step 2: Convert to fraction form
   1,055,256.39/1,582,873.12 = 256,538.78/x
3. Step 3: Cross multiply
   1,055,256.39x = 1,582,873.12 × 256,538.78
4. Step 4: Simplify right side
   1,055,256.39x = 406,068,339,099.59
5. Step 5: Solve for x
   x = 406,068,339,099.59/1,055,256.39
6. Step 6: Final answer
   x = 384,805.38