Finding the Fourth Proportional to 1,210,914.27, 1,671,192.96 and 667,105.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,210,914.27 : 1,671,192.96 = 667,105.78 : x
2. Step 2: Convert to fraction form
   1,210,914.27/1,671,192.96 = 667,105.78/x
3. Step 3: Cross multiply
   1,210,914.27x = 1,671,192.96 × 667,105.78
4. Step 4: Simplify right side
   1,210,914.27x = 1,114,862,483,111.31
5. Step 5: Solve for x
   x = 1,114,862,483,111.31/1,210,914.27
6. Step 6: Final answer
   x = 920,678.29