Finding the Fourth Proportional to 1,186,254.31, 1,637,031.82 and 642,390.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,186,254.31 : 1,637,031.82 = 642,390.69 : x
2. Step 2: Convert to fraction form
   1,186,254.31/1,637,031.82 = 642,390.69/x
3. Step 3: Cross multiply
   1,186,254.31x = 1,637,031.82 × 642,390.69
4. Step 4: Simplify right side
   1,186,254.31x = 1,051,613,998,795.78
5. Step 5: Solve for x
   x = 1,051,613,998,795.78/1,186,254.31
6. Step 6: Final answer
   x = 886,499.63