Finding the Fourth Proportional to 77,880.05, 107,474.51 and 42,070.05

Step by Step Solution

1. Step 1: Write the proportion equation
   77,880.05 : 107,474.51 = 42,070.05 : x
2. Step 2: Convert to fraction form
   77,880.05/107,474.51 = 42,070.05/x
3. Step 3: Cross multiply
   77,880.05x = 107,474.51 × 42,070.05
4. Step 4: Simplify right side
   77,880.05x = 4,521,458,009.43
5. Step 5: Solve for x
   x = 4,521,458,009.43/77,880.05
6. Step 6: Final answer
   x = 58,056.69