Finding the Fourth Proportional to 139,351.47, 208,858.32 and 64,315.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,351.47 : 208,858.32 = 64,315.50 : x
2. Step 2: Convert to fraction form
   139,351.47/208,858.32 = 64,315.50/x
3. Step 3: Cross multiply
   139,351.47x = 208,858.32 × 64,315.50
4. Step 4: Simplify right side
   139,351.47x = 13,432,827,279.96
5. Step 5: Solve for x
   x = 13,432,827,279.96/139,351.47
6. Step 6: Final answer
   x = 96,395.30