Finding the Fourth Proportional to 139,916.87, 193,030.37 and 86,108.47

Step by Step Solution

1. Step 1: Write the proportion equation
   139,916.87 : 193,030.37 = 86,108.47 : x
2. Step 2: Convert to fraction form
   139,916.87/193,030.37 = 86,108.47/x
3. Step 3: Cross multiply
   139,916.87x = 193,030.37 × 86,108.47
4. Step 4: Simplify right side
   139,916.87x = 16,621,549,957.89
5. Step 5: Solve for x
   x = 16,621,549,957.89/139,916.87
6. Step 6: Final answer
   x = 118,795.89