Finding the Fourth Proportional to 78,420.86, 108,221.74 and 42,611.47

Step by Step Solution

1. Step 1: Write the proportion equation
   78,420.86 : 108,221.74 = 42,611.47 : x
2. Step 2: Convert to fraction form
   78,420.86/108,221.74 = 42,611.47/x
3. Step 3: Cross multiply
   78,420.86x = 108,221.74 × 42,611.47
4. Step 4: Simplify right side
   78,420.86x = 4,611,487,050.27
5. Step 5: Solve for x
   x = 4,611,487,050.27/78,420.86
6. Step 6: Final answer
   x = 58,804.34