Finding the Fourth Proportional to 78,697.31, 108,602.30 and 42,887.30

Step by Step Solution

1. Step 1: Write the proportion equation
   78,697.31 : 108,602.30 = 42,887.30 : x
2. Step 2: Convert to fraction form
   78,697.31/108,602.30 = 42,887.30/x
3. Step 3: Cross multiply
   78,697.31x = 108,602.30 × 42,887.30
4. Step 4: Simplify right side
   78,697.31x = 4,657,659,206.35
5. Step 5: Solve for x
   x = 4,657,659,206.35/78,697.31
6. Step 6: Final answer
   x = 59,184.48