Finding the Fourth Proportional to 77,981.82, 107,615.16 and 42,172.08

Step by Step Solution

1. Step 1: Write the proportion equation
   77,981.82 : 107,615.16 = 42,172.08 : x
2. Step 2: Convert to fraction form
   77,981.82/107,615.16 = 42,172.08/x
3. Step 3: Cross multiply
   77,981.82x = 107,615.16 × 42,172.08
4. Step 4: Simplify right side
   77,981.82x = 4,538,355,136.73
5. Step 5: Solve for x
   x = 4,538,355,136.73/77,981.82
6. Step 6: Final answer
   x = 58,197.60