Finding the Fourth Proportional to 78,398.79, 108,186.23 and 42,588.69

Step by Step Solution

1. Step 1: Write the proportion equation
   78,398.79 : 108,186.23 = 42,588.69 : x
2. Step 2: Convert to fraction form
   78,398.79/108,186.23 = 42,588.69/x
3. Step 3: Cross multiply
   78,398.79x = 108,186.23 × 42,588.69
4. Step 4: Simplify right side
   78,398.79x = 4,607,509,512.51
5. Step 5: Solve for x
   x = 4,607,509,512.51/78,398.79
6. Step 6: Final answer
   x = 58,770.16