Finding the Fourth Proportional to 12,688,006.31, 17,509,466.42 and 6,886,789.25

Step by Step Solution

1. Step 1: Write the proportion equation
   12,688,006.31 : 17,509,466.42 = 6,886,789.25 : x
2. Step 2: Convert to fraction form
   12,688,006.31/17,509,466.42 = 6,886,789.25/x
3. Step 3: Cross multiply
   12,688,006.31x = 17,509,466.42 × 6,886,789.25
4. Step 4: Simplify right side
   12,688,006.31x = 120,584,005,114,492
5. Step 5: Solve for x
   x = 120,584,005,114,492/12,688,006.31
6. Step 6: Final answer
   x = 9,503,778.78