Finding the Fourth Proportional to 139,317.30, 208,970.28 and 64,412.82

Step by Step Solution

1. Step 1: Write the proportion equation
   139,317.30 : 208,970.28 = 64,412.82 : x
2. Step 2: Convert to fraction form
   139,317.30/208,970.28 = 64,412.82/x
3. Step 3: Cross multiply
   139,317.30x = 208,970.28 × 64,412.82
4. Step 4: Simplify right side
   139,317.30x = 13,460,365,030.99
5. Step 5: Solve for x
   x = 13,460,365,030.99/139,317.30
6. Step 6: Final answer
   x = 96,616.61