Finding the Fourth Proportional to 112,390.86, 168,611.40 and 42,270.78

Step by Step Solution

1. Step 1: Write the proportion equation
   112,390.86 : 168,611.40 = 42,270.78 : x
2. Step 2: Convert to fraction form
   112,390.86/168,611.40 = 42,270.78/x
3. Step 3: Cross multiply
   112,390.86x = 168,611.40 × 42,270.78
4. Step 4: Simplify right side
   112,390.86x = 7,127,335,394.89
5. Step 5: Solve for x
   x = 7,127,335,394.89/112,390.86
6. Step 6: Final answer
   x = 63,415.61