Finding the Fourth Proportional to 21,300,659.34, 31,918,473.58 and 12,647,719.73

Step by Step Solution

1. Step 1: Write the proportion equation
   21,300,659.34 : 31,918,473.58 = 12,647,719.73 : x
2. Step 2: Convert to fraction form
   21,300,659.34/31,918,473.58 = 12,647,719.73/x
3. Step 3: Cross multiply
   21,300,659.34x = 31,918,473.58 × 12,647,719.73
4. Step 4: Simplify right side
   21,300,659.34x = 403,695,907,889,657.31
5. Step 5: Solve for x
   x = 403,695,907,889,657.31/21,300,659.34
6. Step 6: Final answer
   x = 18,952,272.86