Finding the Fourth Proportional to 387,691.31, 581,564.72 and 103,380.37

Step by Step Solution

1. Step 1: Write the proportion equation
   387,691.31 : 581,564.72 = 103,380.37 : x
2. Step 2: Convert to fraction form
   387,691.31/581,564.72 = 103,380.37/x
3. Step 3: Cross multiply
   387,691.31x = 581,564.72 × 103,380.37
4. Step 4: Simplify right side
   387,691.31x = 60,122,374,737.09
5. Step 5: Solve for x
   x = 60,122,374,737.09/387,691.31
6. Step 6: Final answer
   x = 155,077.95