Finding the Fourth Proportional to 77,880.31, 107,474.72 and 42,070.31

Step by Step Solution

1. Step 1: Write the proportion equation
   77,880.31 : 107,474.72 = 42,070.31 : x
2. Step 2: Convert to fraction form
   77,880.31/107,474.72 = 42,070.31/x
3. Step 3: Cross multiply
   77,880.31x = 107,474.72 × 42,070.31
4. Step 4: Simplify right side
   77,880.31x = 4,521,494,787.56
5. Step 5: Solve for x
   x = 4,521,494,787.56/77,880.31
6. Step 6: Final answer
   x = 58,056.97