Finding the Fourth Proportional to 42,156.63, 63,234.86 and 12,573.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,156.63 : 63,234.86 = 12,573.72 : x
2. Step 2: Convert to fraction form
   42,156.63/63,234.86 = 12,573.72/x
3. Step 3: Cross multiply
   42,156.63x = 63,234.86 × 12,573.72
4. Step 4: Simplify right side
   42,156.63x = 795,097,361.01
5. Step 5: Solve for x
   x = 795,097,361.01/42,156.63
6. Step 6: Final answer
   x = 18,860.55