Finding the Fourth Proportional to 1,036,142.47, 1,555,099.40 and 405,499.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,036,142.47 : 1,555,099.40 = 405,499.15 : x
2. Step 2: Convert to fraction form
   1,036,142.47/1,555,099.40 = 405,499.15/x
3. Step 3: Cross multiply
   1,036,142.47x = 1,555,099.40 × 405,499.15
4. Step 4: Simplify right side
   1,036,142.47x = 630,591,484,865.51
5. Step 5: Solve for x
   x = 630,591,484,865.51/1,036,142.47
6. Step 6: Final answer
   x = 608,595.35