Finding the Fourth Proportional to 12,804,978.60, 19,170,143.10 and 12,431,730.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,804,978.60 : 19,170,143.10 = 12,431,730.60 : x
2. Step 2: Convert to fraction form
   12,804,978.60/19,170,143.10 = 12,431,730.60/x
3. Step 3: Cross multiply
   12,804,978.60x = 19,170,143.10 × 12,431,730.60
4. Step 4: Simplify right side
   12,804,978.60x = 238,318,054,582,648.88
5. Step 5: Solve for x
   x = 238,318,054,582,648.88/12,804,978.60
6. Step 6: Final answer
   x = 18,611,359.07