Finding the Fourth Proportional to 21,422,531.60, 29,552,162.28 and 13,679,432.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,422,531.60 : 29,552,162.28 = 13,679,432.72 : x
2. Step 2: Convert to fraction form
   21,422,531.60/29,552,162.28 = 13,679,432.72/x
3. Step 3: Cross multiply
   21,422,531.60x = 29,552,162.28 × 13,679,432.72
4. Step 4: Simplify right side
   21,422,531.60x = 404,256,815,639,781.81
5. Step 5: Solve for x
   x = 404,256,815,639,781.81/21,422,531.60
6. Step 6: Final answer
   x = 18,870,636.92