Finding the Fourth Proportional to 20,786,796.60, 31,180,440.94 and 12,591,225.98

Step by Step Solution

1. Step 1: Write the proportion equation
   20,786,796.60 : 31,180,440.94 = 12,591,225.98 : x
2. Step 2: Convert to fraction form
   20,786,796.60/31,180,440.94 = 12,591,225.98/x
3. Step 3: Cross multiply
   20,786,796.60x = 31,180,440.94 × 12,591,225.98
4. Step 4: Simplify right side
   20,786,796.60x = 392,599,978,078,056.69
5. Step 5: Solve for x
   x = 392,599,978,078,056.69/20,786,796.60
6. Step 6: Final answer
   x = 18,886,988.01