Finding the Fourth Proportional to 16,820,538.20, 25,138,648.72 and 12,281,157.20

Step by Step Solution

1. Step 1: Write the proportion equation
   16,820,538.20 : 25,138,648.72 = 12,281,157.20 : x
2. Step 2: Convert to fraction form
   16,820,538.20/25,138,648.72 = 12,281,157.20/x
3. Step 3: Cross multiply
   16,820,538.20x = 25,138,648.72 × 12,281,157.20
4. Step 4: Simplify right side
   16,820,538.20x = 308,731,696,725,898.75
5. Step 5: Solve for x
   x = 308,731,696,725,898.75/16,820,538.20
6. Step 6: Final answer
   x = 18,354,448.18