Finding the Fourth Proportional to 42,956.88, 64,425.60 and 19,590

Step by Step Solution

1. Step 1: Write the proportion equation
   42,956.88 : 64,425.60 = 19,590 : x
2. Step 2: Convert to fraction form
   42,956.88/64,425.60 = 19,590/x
3. Step 3: Cross multiply
   42,956.88x = 64,425.60 × 19,590
4. Step 4: Simplify right side
   42,956.88x = 1,262,097,504
5. Step 5: Solve for x
   x = 1,262,097,504/42,956.88
6. Step 6: Final answer
   x = 29,380.57