Finding the Fourth Proportional to 12,947.90, 19,422.45 and 4,631.85

Step by Step Solution

1. Step 1: Write the proportion equation
   12,947.90 : 19,422.45 = 4,631.85 : x
2. Step 2: Convert to fraction form
   12,947.90/19,422.45 = 4,631.85/x
3. Step 3: Cross multiply
   12,947.90x = 19,422.45 × 4,631.85
4. Step 4: Simplify right side
   12,947.90x = 89,961,875.03
5. Step 5: Solve for x
   x = 89,961,875.03/12,947.90
6. Step 6: Final answer
   x = 6,947.99