Finding the Fourth Proportional to 76,780.16, 105,957.80 and 42,787.72

Step by Step Solution

1. Step 1: Write the proportion equation
   76,780.16 : 105,957.80 = 42,787.72 : x
2. Step 2: Convert to fraction form
   76,780.16/105,957.80 = 42,787.72/x
3. Step 3: Cross multiply
   76,780.16x = 105,957.80 × 42,787.72
4. Step 4: Simplify right side
   76,780.16x = 4,533,692,678.22
5. Step 5: Solve for x
   x = 4,533,692,678.22/76,780.16
6. Step 6: Final answer
   x = 59,047.71