Finding the Fourth Proportional to 5,181,978.81, 7,773,964.50 and 1,986,855.78

Step by Step Solution

1. Step 1: Write the proportion equation
   5,181,978.81 : 7,773,964.50 = 1,986,855.78 : x
2. Step 2: Convert to fraction form
   5,181,978.81/7,773,964.50 = 1,986,855.78/x
3. Step 3: Cross multiply
   5,181,978.81x = 7,773,964.50 × 1,986,855.78
4. Step 4: Simplify right side
   5,181,978.81x = 15,445,746,300,339.81
5. Step 5: Solve for x
   x = 15,445,746,300,339.81/5,181,978.81
6. Step 6: Final answer
   x = 2,980,665.66