Finding the Fourth Proportional to 1,217,049.42, 1,678,001.32 and 780,697.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,217,049.42 : 1,678,001.32 = 780,697.42 : x
2. Step 2: Convert to fraction form
   1,217,049.42/1,678,001.32 = 780,697.42/x
3. Step 3: Cross multiply
   1,217,049.42x = 1,678,001.32 × 780,697.42
4. Step 4: Simplify right side
   1,217,049.42x = 1,310,011,301,280.59
5. Step 5: Solve for x
   x = 1,310,011,301,280.59/1,217,049.42
6. Step 6: Final answer
   x = 1,076,383.00