Finding the Fourth Proportional to 56,340.90, 77,667.57 and 42,888.74

Step by Step Solution

1. Step 1: Write the proportion equation
   56,340.90 : 77,667.57 = 42,888.74 : x
2. Step 2: Convert to fraction form
   56,340.90/77,667.57 = 42,888.74/x
3. Step 3: Cross multiply
   56,340.90x = 77,667.57 × 42,888.74
4. Step 4: Simplify right side
   56,340.90x = 3,331,063,827.82
5. Step 5: Solve for x
   x = 3,331,063,827.82/56,340.90
6. Step 6: Final answer
   x = 59,123.37