Finding the Fourth Proportional to 28,429,393.56, 42,648,548.58 and 12,259,940.28

Step by Step Solution

1. Step 1: Write the proportion equation
   28,429,393.56 : 42,648,548.58 = 12,259,940.28 : x
2. Step 2: Convert to fraction form
   28,429,393.56/42,648,548.58 = 12,259,940.28/x
3. Step 3: Cross multiply
   28,429,393.56x = 42,648,548.58 × 12,259,940.28
4. Step 4: Simplify right side
   28,429,393.56x = 522,868,658,619,478.75
5. Step 5: Solve for x
   x = 522,868,658,619,478.75/28,429,393.56
6. Step 6: Final answer
   x = 18,391,833.00