Finding the Fourth Proportional to 9,986,856.12, 13,781,856.78 and 5,636,854.80

Step by Step Solution

1. Step 1: Write the proportion equation
   9,986,856.12 : 13,781,856.78 = 5,636,854.80 : x
2. Step 2: Convert to fraction form
   9,986,856.12/13,781,856.78 = 5,636,854.80/x
3. Step 3: Cross multiply
   9,986,856.12x = 13,781,856.78 × 5,636,854.80
4. Step 4: Simplify right side
   9,986,856.12x = 77,686,325,543,255.53
5. Step 5: Solve for x
   x = 77,686,325,543,255.53/9,986,856.12
6. Step 6: Final answer
   x = 7,778,856.99