Finding the Fourth Proportional to 137,429.58, 189,639.98 and 76,987.40

Step by Step Solution

1. Step 1: Write the proportion equation
   137,429.58 : 189,639.98 = 76,987.40 : x
2. Step 2: Convert to fraction form
   137,429.58/189,639.98 = 76,987.40/x
3. Step 3: Cross multiply
   137,429.58x = 189,639.98 × 76,987.40
4. Step 4: Simplify right side
   137,429.58x = 14,599,889,662.82
5. Step 5: Solve for x
   x = 14,599,889,662.82/137,429.58
6. Step 6: Final answer
   x = 106,235.43