Finding the Fourth Proportional to 117,312.31, 161,848.56 and 77,047.89

Step by Step Solution

1. Step 1: Write the proportion equation
   117,312.31 : 161,848.56 = 77,047.89 : x
2. Step 2: Convert to fraction form
   117,312.31/161,848.56 = 77,047.89/x
3. Step 3: Cross multiply
   117,312.31x = 161,848.56 × 77,047.89
4. Step 4: Simplify right side
   117,312.31x = 12,470,090,047.54
5. Step 5: Solve for x
   x = 12,470,090,047.54/117,312.31
6. Step 6: Final answer
   x = 106,298.22