Finding the Fourth Proportional to 76,386.05, 105,411.18 and 42,394.28

Step by Step Solution

1. Step 1: Write the proportion equation
   76,386.05 : 105,411.18 = 42,394.28 : x
2. Step 2: Convert to fraction form
   76,386.05/105,411.18 = 42,394.28/x
3. Step 3: Cross multiply
   76,386.05x = 105,411.18 × 42,394.28
4. Step 4: Simplify right side
   76,386.05x = 4,468,831,080.05
5. Step 5: Solve for x
   x = 4,468,831,080.05/76,386.05
6. Step 6: Final answer
   x = 58,503.24