Finding the Fourth Proportional to 42,188, 63,292.58 and 12,605.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,188 : 63,292.58 = 12,605.72 : x
2. Step 2: Convert to fraction form
   42,188/63,292.58 = 12,605.72/x
3. Step 3: Cross multiply
   42,188x = 63,292.58 × 12,605.72
4. Step 4: Simplify right side
   42,188x = 797,848,541.56
5. Step 5: Solve for x
   x = 797,848,541.56/42,188
6. Step 6: Final answer
   x = 18,911.74