Finding the Fourth Proportional to 136,784.72, 205,111.20 and 64,677.56

Step by Step Solution

1. Step 1: Write the proportion equation
   136,784.72 : 205,111.20 = 64,677.56 : x
2. Step 2: Convert to fraction form
   136,784.72/205,111.20 = 64,677.56/x
3. Step 3: Cross multiply
   136,784.72x = 205,111.20 × 64,677.56
4. Step 4: Simplify right side
   136,784.72x = 13,266,091,944.67
5. Step 5: Solve for x
   x = 13,266,091,944.67/136,784.72
6. Step 6: Final answer
   x = 96,985.19