Finding the Fourth Proportional to 42,077.48, 63,129.31 and 12,495.47

Step by Step Solution

1. Step 1: Write the proportion equation
   42,077.48 : 63,129.31 = 12,495.47 : x
2. Step 2: Convert to fraction form
   42,077.48/63,129.31 = 12,495.47/x
3. Step 3: Cross multiply
   42,077.48x = 63,129.31 × 12,495.47
4. Step 4: Simplify right side
   42,077.48x = 788,830,052.34
5. Step 5: Solve for x
   x = 788,830,052.34/42,077.48
6. Step 6: Final answer
   x = 18,747.09