Finding the Fourth Proportional to 137,085.78, 189,177.30 and 76,656.54

Step by Step Solution

1. Step 1: Write the proportion equation
   137,085.78 : 189,177.30 = 76,656.54 : x
2. Step 2: Convert to fraction form
   137,085.78/189,177.30 = 76,656.54/x
3. Step 3: Cross multiply
   137,085.78x = 189,177.30 × 76,656.54
4. Step 4: Simplify right side
   137,085.78x = 14,501,677,264.54
5. Step 5: Solve for x
   x = 14,501,677,264.54/137,085.78
6. Step 6: Final answer
   x = 105,785.42