Finding the Fourth Proportional to 21,312,097.70, 31,931,404.95 and 9,929,200.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,312,097.70 : 31,931,404.95 = 9,929,200.10 : x
2. Step 2: Convert to fraction form
   21,312,097.70/31,931,404.95 = 9,929,200.10/x
3. Step 3: Cross multiply
   21,312,097.70x = 31,931,404.95 × 9,929,200.10
4. Step 4: Simplify right side
   21,312,097.70x = 317,053,309,222,680.50
5. Step 5: Solve for x
   x = 317,053,309,222,680.50/21,312,097.70
6. Step 6: Final answer
   x = 14,876,682.42