Finding the Fourth Proportional to 42,077.70, 63,111.69 and 12,492.45

Step by Step Solution

1. Step 1: Write the proportion equation
   42,077.70 : 63,111.69 = 12,492.45 : x
2. Step 2: Convert to fraction form
   42,077.70/63,111.69 = 12,492.45/x
3. Step 3: Cross multiply
   42,077.70x = 63,111.69 × 12,492.45
4. Step 4: Simplify right side
   42,077.70x = 788,419,631.74
5. Step 5: Solve for x
   x = 788,419,631.74/42,077.70
6. Step 6: Final answer
   x = 18,737.23