Finding the Fourth Proportional to 42,419.77, 63,630.56 and 12,837.56

Step by Step Solution

1. Step 1: Write the proportion equation
   42,419.77 : 63,630.56 = 12,837.56 : x
2. Step 2: Convert to fraction form
   42,419.77/63,630.56 = 12,837.56/x
3. Step 3: Cross multiply
   42,419.77x = 63,630.56 × 12,837.56
4. Step 4: Simplify right side
   42,419.77x = 816,860,845.77
5. Step 5: Solve for x
   x = 816,860,845.77/42,419.77
6. Step 6: Final answer
   x = 19,256.61