Finding the Fourth Proportional to 21,087,063.10, 31,567,609.05 and 12,563,011.90

Step by Step Solution

1. Step 1: Write the proportion equation
   21,087,063.10 : 31,567,609.05 = 12,563,011.90 : x
2. Step 2: Convert to fraction form
   21,087,063.10/31,567,609.05 = 12,563,011.90/x
3. Step 3: Cross multiply
   21,087,063.10x = 31,567,609.05 × 12,563,011.90
4. Step 4: Simplify right side
   21,087,063.10x = 396,584,248,149,697.69
5. Step 5: Solve for x
   x = 396,584,248,149,697.69/21,087,063.10
6. Step 6: Final answer
   x = 18,806,993.00