Finding the Fourth Proportional to 112,405.30, 155,114.71 and 61,419.78

Step by Step Solution

1. Step 1: Write the proportion equation
   112,405.30 : 155,114.71 = 61,419.78 : x
2. Step 2: Convert to fraction form
   112,405.30/155,114.71 = 61,419.78/x
3. Step 3: Cross multiply
   112,405.30x = 155,114.71 × 61,419.78
4. Step 4: Simplify right side
   112,405.30x = 9,527,111,209.41
5. Step 5: Solve for x
   x = 9,527,111,209.41/112,405.30
6. Step 6: Final answer
   x = 84,756.78