Finding the Fourth Proportional to 78,639,162.50, 117,958,642.22 and 21,131,434.41

Step by Step Solution

1. Step 1: Write the proportion equation
   78,639,162.50 : 117,958,642.22 = 21,131,434.41 : x
2. Step 2: Convert to fraction form
   78,639,162.50/117,958,642.22 = 21,131,434.41/x
3. Step 3: Cross multiply
   78,639,162.50x = 117,958,642.22 × 21,131,434.41
4. Step 4: Simplify right side
   78,639,162.50x = 2,492,635,311,217,415.50
5. Step 5: Solve for x
   x = 2,492,635,311,217,415.50/78,639,162.50
6. Step 6: Final answer
   x = 31,697,124.34