Finding the Fourth Proportional to 1,216,002.69, 1,678,090.49 and 664,719.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216,002.69 : 1,678,090.49 = 664,719.32 : x
2. Step 2: Convert to fraction form
   1,216,002.69/1,678,090.49 = 664,719.32/x
3. Step 3: Cross multiply
   1,216,002.69x = 1,678,090.49 × 664,719.32
4. Step 4: Simplify right side
   1,216,002.69x = 1,115,459,157,697.22
5. Step 5: Solve for x
   x = 1,115,459,157,697.22/1,216,002.69
6. Step 6: Final answer
   x = 917,316.36