Finding the Fourth Proportional to 139,857.53, 209,851.91 and 69,742.31

Step by Step Solution

1. Step 1: Write the proportion equation
   139,857.53 : 209,851.91 = 69,742.31 : x
2. Step 2: Convert to fraction form
   139,857.53/209,851.91 = 69,742.31/x
3. Step 3: Cross multiply
   139,857.53x = 209,851.91 × 69,742.31
4. Step 4: Simplify right side
   139,857.53x = 14,635,556,961.31
5. Step 5: Solve for x
   x = 14,635,556,961.31/139,857.53
6. Step 6: Final answer
   x = 104,646.19