Finding the Fourth Proportional to 1,059,142.86, 1,588,700.48 and 260,431.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,059,142.86 : 1,588,700.48 = 260,431.34 : x
2. Step 2: Convert to fraction form
   1,059,142.86/1,588,700.48 = 260,431.34/x
3. Step 3: Cross multiply
   1,059,142.86x = 1,588,700.48 × 260,431.34
4. Step 4: Simplify right side
   1,059,142.86x = 413,747,385,619.38
5. Step 5: Solve for x
   x = 413,747,385,619.38/1,059,142.86
6. Step 6: Final answer
   x = 390,643.61